I just tried the new profiles for Kobo (Aura in my case) and it appears that the images are too small.
When I open it on my Kobo it has very large margins.
I tested before with Other on 758x1024 and that appears to work perfect for me.
Both are tested with png to cbz.

I want to convert a manga which is in 2-page per jpeg layout into a single page per jpeg manga, to be read on my Kobo aura. I'm glad that the program will split 2-page images properly into 2 single-image image files. However, because it is manga, and is to be read from right to left, the naming of the files seems to be wrong.

For example,
manga_000001_000000_kcca.jpg (which is the left panel)
manga_000001_000000_kccb.jpg (which is the right panel)
It should be the other way round, where kcca should be named as kccb, and kccb should be named as kcca, since manga is read from right to left. As it is, it will not be viewed correctly on kobo reader, where the left panel is viewed before the right panel.

Other than this, which is a critical issue, the program runs smoothly on my windows 7.

I also notice that for some devices, eg kobo aura, the 'manga mode' is not selectable. Also, choosing output as cbz format also greys out 'manga mode'. I wonder why this is the case.